Asphaltic emulsion and process of making



CHARLTON WILDER, F CINCINNATI, OHIO, AssIoNoR To-THE 'cRowNizo'cKco Nrh a Patented Feb. 18, 1930 .r

UNITED STATES OF CINCINNATI, OHIO, A CORPORA ION oF o IZt ASPHALT-I0 EMULSION AND PROCESS-0E MAKING?" No Drawing.

My invention relates to emulsions of water and bitumen, such as asphalt. Bitumen, (particularly asphalt) is used as the binder or as a component of the binder in making a great variety of plastic materials. The hard and gummy characteristics of the asphalt are the reason for its use, from the viewpoint of the finished structure. But these same characteristics are the dctriments incidental to its use up to the time the structure is completed.

Emulsified asphalt lacks these hard gummy characteristics. Therefore it is expedient to emulsify an asphaltic binder and retain the same in said emulsified condition as approximately as possible to its final structural state when complete and permanent destruction of the emulsion becomes as requisite as the initial formation of the emulsion.

The object of my invention therefore, is to provide an emulsifying agent adapted to induce an emulsion of a bitumen such as asphalt with water.

Another object of my invention is to provide a mobile bituminous binder for a plastic material.

Another object of my invention is to provide an emulsifying agent for bitumen and Water, said emulsifying agent adapted to be rendered impotent as such by dehydration.

Another object of my invention is to provide a process of constituting plastic structures.

My emulsifying agent is a maltha, i. e., a natural mineral pitch between asphalt and petroleum in viscosity and said by chemists to be high in unsaturated hydrocarbons.

In making these emulsions of water with a bitumen such as asphalt, the maltha is finely divided and water added thereto until the mobility of the mass is in excess of the requisite mobility of the ultimate material. Heat up to a temperature aproximating the boiling pointof water accelerates this step. Bitumen such as asphalt is then mixed with maltha and water. The mobility of the asphalt which is requisite for mixing can be achieved by division thereof or by heat, ro-

' vided the temperature of the entire mass oes not rise to a water dispelling temperature.

Application filed October 26, 1927. Serial No. 228,972. 1 2

slowly to the maltha in orderto avoid thepresence atany one time of a large quantity of material in gummy condition. This mixing operation can be and preferably is carried on in the presence of the solid components of the plastic since a very thorough and uniform mixture is thus achieved. For instance, a volume of maltha impregnating from ten to twenty times its weight of finely divided silica is mixed with between 2 and 10% of 90 penetration oil asphalt in the presence of sufficient water to emulsify the asphalt, for instance, from on up depending on the quantity of asphalt added. The amount of asphalt can be varied to meet the requirements of the intended plastic. After the desired quantity of asphalt has been added, the material is in emulsified condition and can be readily and conveniently manipulated up until the time it is to be dehydrated.

One of the virtues of the maltha asan emulsifying agent for a bituminous binder is the excellent binding qualities of the maltha itself. This obviates the necessity of using the quantity of asphalt which would otherwise be necessary.

When the hard gummy qualities of the binder are again desired, the plastic is dehydrated preferably by heating the same to a temperature in excess of the boiling point of water, but not to a temperature which might injure any of the components of the plastic. A temperature of 225 F. is highly suitable for this dehydrating operation. The heating binder mobile by mixing therewith amaltha and water to provide a material easily handled, and the step of destroying said mobility by dehydrating and cooling the plastic. I 2. In the art of constituting plastic structures, the step of rendering mobile a binder comprising asphalt and maltha by emulsifying water therewith to provide a material easily handled, and the step of expelling said water by subjecting the binder to a temperature in excess of the boiling point of water.

3. In the art of constituting plastic structures, the step of mixing an aggregate impregnated with maltha, with asphalt and Water to provide an emulsified material easily handled, and the step of destroying said emulsion by dehydration just antecedent to the structural formation of the plastic.

In witness whereof, I hereunto subscribe CHARLTON WILDER.

my name. 

